Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may be unable to create new online meetings from shared calendar events in Exchange Online – ONGOING

01/06/2026 08:49:00 AM

NHSmail Reference: INC46838876

Microsoft Reference: EX1327187

Issue Status: ONGOING

Issue Description: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.

Current Update: 05/06/2026 08:50:00 AM – Microsoft’s work on developing and validating the code fix continues. The additional time ensures that all impacted areas are captured in the fix and helps us verify its effectiveness before beginning deployment.

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact.

Next update by: Monday, June 08, 2026, at 6:00 PM UTC